The MedSource Fingertip Pulse Oximeter measures the SpO2, Pulse Rate, and Pulse Bar, and displays results accurately on the LED screen. The Fingertip Pulse Oximeter is also compact and lightweight for on-the-go use. Simple Operation SpO2%, PR and Pulse Bar displayed on LED screen Light, compact (60g including two AAA batteries) Low power consumption Indication when the battery is low and an Auto-Shutoff feature.